You are confused with your life because you have no goals and you dont want to get married. And you are an atheist (this is also why you have no goals).
I have been living longer than you (yes, I'm in my 40s). I have experienced and made many friends from different countries. I have lived abroad away from my parents house for about 7 years. I have worked many different jobs in two different countries. After all these years, I could say "the purpose of Life is to get the experience of being alive". Without these experience, life is boring like yours. Having a family of your own (with a husband and a baby) is also a life experience. Why would anyone not doing anything in life? to feel sorrow, to feel joy, to feel angry, to feel in love are the purpose of life. I wouldnt go further into any religion and God. But to experience life is the purpose of life.
40 year old man